Temporary failure in name resolution, Error encounter many times.

[nadlerz]

I encountered this once during, "yum update"

[root@server ~]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os error was
[Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Error: Cannot find a valid baseurl for repo: base
[root@server ~]#

Second when running some php files here: http://www.phcorner.me/mp3-search/index.php?source=4shared&search=britney

Warning: file_get_contents() [function.file-get-contents]: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution

Third during authentication @ twitter and Vk.com;

Unable to Connect to ssl://api.vk.com:443. Error #0: php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution

Please help me fix this , Thanks !

 

[zEitEr]

Hello,

Output of

cat /etc/resolv.conf

iptables-save

?